Ruling on drinking date and grape juice before it ferments

The fuqaha’ are agreed that with regard to dry dates, fresh
dates and raisins, if each one of these on its own is soaked in water, then
it is permissible to drink that water, so long as it will not cause
intoxication, and this is what is called nabeedh.

It was narrated that Abu Sa‘eed al-Khudri (may Allah be
pleased with him) said: The Messenger of Allah (blessings and peace of Allah
be upon him) said: “Whoever among you drinks nabeedh, let him drink it made
from raisins on their own, or dried dates on their own, or unripe dates on
their own.” Narrated by Muslim (1987).

Rather this nabeedh is prohibited if it becomes strong and
turns into khamr (wine, intoxicant). But before it becomes strong, drinking
it is permissible.

Shaykh Muhammad Saalih al-‘Uthaymeen (may Allah have mercy on
him) said: Is grape juice, orange juice and so on haraam or not?

The answer is: It is undoubtedly halaal, unless it has begun
to ferment and developed foam on top, in which case it is haraam, or if
three days have passed according to the well-known view, even if it has not
fermented; it still becomes haraam. They said: That is because after three
days, juice usually ferments, and because fermentation may not be apparent,
the ruling is based on what usually happens, which is that fermentation
occurs after three days.

But the correct view is something other than that. The
correct view is that it does not become haraam after three days, especially
in cold countries. But if it is in a hot country, then after three days it
should be examined, and to be on the safe side it should be avoided and
given to animals and the like, because there is the fear that it may have
fermented without you realising.

End quote from ash-Sharh al-Mumti‘ ‘ala Zaad al-Mustaqni‘
(14/305, 306).

With regard to small ratios of alcohol, that does not matter,
unless it has the effect of making the drink intoxicant. Any drink that
causes the drinker to become intoxicated comes under the heading of khamr,
which is haraam. Even if intoxication only occurs when a large amount is
drunk, consuming it is completely haraam.

For more information, please see the answers to questions
146710 and 126641.

And Allah knows best.